<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var xhr=new XMLHttpRequest();
        xhr.onreadystatechange=function(){
            if(xhr.readyState===XMLHttpRequest.DONE){
                var data=xhr.responseXML;
                var booklist=data.getElementsByTagName('booklist')[0];
            console.log(booklist.childNodes);
            }
        };
        xhr.open('GET','/test/xmldata');
        xhr.send();
    </script>
</body>
</html>